Hi Linuxers,
There is one problem bothering me for a long time: A "Server not found" error always popped out when I try to use firefox to open certain web site such as gmail.com, cnn.com, weather.com. However I can open the other 95% web sites without any problems. I tried another two browsers(mozilla and konqueror), the problem still exits. I guess it not the problem of firefox. I am currently using a university network. The DNS and Ip address is set correctly. Any suggestion? The following is system configuration:

Kernel: 2.6.11-1.35_FC3smp
Firefox: 2.0
/etc/hosts:
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain imagination.xxx.edu localhost imagination
10.227.152.182 imagination

Thanks

Jeremy

Are you using squid? Possibly a DNS issue with your provider?

Well, I am not sure whether I use squid. when I type dig www.gmail.com on the console, the response is
dig www.gmail.com

; <<>> DiG 9.2.4 <<>> www.gmail.com
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 46251
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 7, ADDITIONAL: 7

;; QUESTION SECTION:
;www.gmail.com. IN A

;; ANSWER SECTION:
www.gmail.com. 808 IN CNAME mail.google.com.
mail.google.com. 102457 IN CNAME googlemail.l.google.com.
googlemail.l.google.com. 203 IN A 66.249.83.19
googlemail.l.google.com. 203 IN A 66.249.83.83

;; AUTHORITY SECTION:
l.google.com. 83375 IN NS d.l.google.com.
l.google.com. 83375 IN NS e.l.google.com.
l.google.com. 83375 IN NS f.l.google.com.
l.google.com. 83375 IN NS g.l.google.com.
l.google.com. 83375 IN NS a.l.google.com.
l.google.com. 83375 IN NS b.l.google.com.
l.google.com. 83375 IN NS c.l.google.com.

;; ADDITIONAL SECTION:
a.l.google.com. 71437 IN A 216.239.53.9
b.l.google.com. 68944 IN A 64.233.179.9
c.l.google.com. 68944 IN A 64.233.161.9
d.l.google.com. 49623 IN A 64.233.183.9
e.l.google.com. 71480 IN A 66.102.11.9
f.l.google.com. 70634 IN A 72.14.235.9
g.l.google.com. 71480 IN A 64.233.167.9

;; Query time: 6 msec
;; SERVER: 128.227.116.1#53(128.227.116.1)
;; WHEN: Tue Nov 28 12:34:09 2006
;; MSG SIZE rcvd: 340

When type dig linuxquestions.org

; <<>> DiG 9.2.4 <<>> linuxquestions.org
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59245
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 1

;; QUESTION SECTION:
;linuxquestions.org. IN A

;; ANSWER SECTION:
linuxquestions.org. 14400 IN A 64.179.4.146

;; AUTHORITY SECTION:
linuxquestions.org. 9432 IN NS ns1.linuxquestions.net.
linuxquestions.org. 9432 IN NS ns1.linuxquestions.org.
linuxquestions.org. 9432 IN NS ns2.linuxquestions.org.

;; ADDITIONAL SECTION:
ns1.linuxquestions.net. 93932 IN A 64.179.4.150

;; Query time: 66 msec
;; SERVER: 128.227.116.1#53(128.227.116.1)
;; WHEN: Tue Nov 28 12:36:21 2006
;; MSG SIZE rcvd: 140

I can go to Linuxquestions.org, but not gmail.com Thanks